| Density values of a Dirichlet distribution {Compositional} | R Documentation |
Density values of a Dirichlet distribution
Description
Density values of a Dirichlet distribution.
Usage
ddiri(x, a, logged = TRUE)
Arguments
x |
A matrix containing compositional data. This can be a vector or a matrix with the data. |
a |
A vector of parameters. Its length must be equal to the number of components, or columns of the matrix with the compositional data and all values must be greater than zero. |
logged |
A boolean variable specifying whether the logarithm of the density values to be returned. It is set to TRUE by default. |
Details
The density of the Dirichlet distribution for a vector or a matrix of compositional data is returned.
Value
A vector with the density values.
Author(s)
Michail Tsagris.
R implementation and documentation: Michail Tsagris mtsagris@uoc.gr.
References
Ng Kai Wang, Guo-Liang Tian and Man-Lai Tang (2011). Dirichlet and related distributions: Theory, methods and applications. John Wiley & Sons.
See Also
dgendiri, diri.nr, diri.est, diri.contour, rdiri, dda
Examples
x <- rdiri( 100, c(5, 7, 4, 8, 10, 6, 4) )
a <- diri.est(x)
f <- ddiri(x, a$param)
sum(f)
a